OFFSET
1,2
COMMENTS
Row 4 of A200942
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 2*a(n-1) +a(n-2) -3*a(n-3) -a(n-4) +a(n-5) +3*a(n-6) -a(n-7) -2*a(n-8) +a(n-9) for n>11
Empirical g.f.: x+7x^2 -x^3*(3+9*x+13*x^2+x^4+9*x^3) / ( (1+x+x^2)*(1+x)^2*(x-1)^5 ). - R. J. Mathar, Nov 25 2011
EXAMPLE
Some solutions for n=8
..1....1....0....1....0....0....1....2....1....3....1....2....4....0....0....1
..7....3....1....2....1....1....4....5....6....7....4....4....5....2....2....4
..6....2....2....3....5....6....5....4....4....5....5....7....8....8....4....6
..8....4....5....8....4....7....6....8....8....8....7....8....7....4....8....8
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Nov 24 2011
STATUS
approved